JPH0417794A - Self-priming pump - Google Patents

Abstract

PURPOSE:To suppress the vibration of a pump and reduce noise by allowing the top edge of the blade of one impeller to pass through a flow-out passage port, and allowing the top edge of the other blade to pass through a passage for the communication between a flow-out tank part and an impeller chamber. CONSTITUTION:The top edge (e) of one blade of an impeller 10 passes through the inlet of a flow-out passage 12, and at the same time, the top edge (f) of the other blade passes through a passage 14 for the communication between a feeding-out tank part 13 and an impeller chamber 11. Since the top edges of two blades pass through the inlet of the flow-out passage 12 and the passage 14 at the same time, the phases of the flow-in and out at the inlet of the flow- out passage 12 and in the flow passage 14 coincide. The phase of the stream of the pulsation flow coincides, and a smooth flow is obtained, and the impact applied on an impeller casing 3 can be reduced. Accordingly, vibration suppressing for a pump and reduction of noise can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a self-priming pump having an impeller having a plurality of blades disposed within an impeller casing.

BACKGROUND ART A self-priming pump generally has an impeller casing that houses an impeller, and a priming tank for supplying priming water to the impeller casing.

A root wheel casing 3 is attached, and the rotating shaft 2 of the electric motor 1 is coupled to an impeller (not shown) in the impeller casing 3. A priming casing 4 is connected to the open side of the impeller casing 3 via a packing 5.

FIG. 6 is an exploded perspective view. As shown in FIG. 6, the impeller casing 3 and the priming casing 4 have their openings facing each other.

The partition plate 6 is held between the impeller casing 3 and the priming casing 4 together with the packing 5. The partition plate 6 has a water flow passage hole 7 and a flow hole 8 formed at predetermined positions, and a center flow hole 9. It is constructed to prevent water from leaking from around 9. Further, an impeller 10 is housed in an impeller chamber 11 within the impeller casing. A rotary shaft 2 is inserted into the center of the impeller chamber 11, and an impeller 1-0 is mounted at its tip with a mechanical seal sandwiched therebetween.

FIG. 7 shows the structure of the impeller casing 3.

The impeller casing 3 has an impeller chamber 11, and the impeller casing 3 has an impeller chamber 11.
A passage 12 for draining water from the casing 11 to the delivery tank section 13 and a communication passage 14 from the delivery tank section 13 to the impeller chamber 11 are provided.

FIG. 8 shows the configuration of the priming casing 4.

As shown in the figure, there is a suction port 41 in the priming casing 4.
A suction flow path 15 and a water tank portion 16 are formed which communicate with the water tank. The suction passage 15 communicates with the impeller chamber 11 on the impeller casing side through the central communication hole 9 of the partition plate 6 shown in FIG. Further, the water tank section 16 communicates with the delivery tank section on the impeller side through the communication hole 7 of the partition plate 6, and communicates with the impeller chamber 11 through the communication hole 8.

In the figure, 17 is a steam/water separation chamber, and 42 is a discharge port.

FIG. 13 is an explanatory diagram showing a state in which the present self-priming pump is used to circulate water in an aquarium.

In FIG. 13, 40 is a water tank, 43 is a self-priming pump equipped with a suction port 41 and a discharge port 42, and is connected to the water tank 40 through a discharge side pipe 44 and a suction side pipe 45.

Next, the operation will be explained. First, priming water is injected into the priming casing 4 in advance. The water injected into the priming casing 4 will enter the impeller chamber 11. Then, when the electric motor 1 is driven, the impeller 10 in the impeller chamber 11 rotates. Then, the water in the impeller chamber 11 will be stirred by the impeller 10, and at this time, air will be mixed into the water. The water mixed with air is indicated by the arrow a in Figure 9.
As shown in FIG. 2, the liquid enters the delivery tank section 13 through the discharge passage 12. Here, the water with some air mixed in is circulated into the impeller chamber 11 through the communication passage 14 as shown by the arrow. Further, most of the water mixed with air flows into the water tank portion 16 of the priming casing 4 shown in FIG. 10 through the flow hole 7 of the partition plate 6. A steam/water separation chamber 17 is provided in the upper part of the water tank section 16 in the priming casing 4. Water flowing out from the flow hole 7 of the partition plate 6 is separated from air in the steam/water separation chamber 17, and its Air is discharged into the water tank 40 from the discharge port 42 through the discharge side pipe line 44, as shown by arrow C in FIG.

The remaining water returns from the water tank 16 to the impeller chamber 11 of the impeller casing 3 through the flow hole 8 of the partition plate 6, as shown by arrow d. That is, water circulates between the impeller chamber 11 and the water tank section 16, and only air flows out. If this state continues, the air pressure in the center of the impeller chamber 11 and the suction passage 15 gradually decreases. The water in the water tank 40 will be sucked up due to the difference in pressure between the pressure inside the suction passage 15 and the outside pressure. When the water in the water tank 40 flows into the suction passage 15 from the suction port 41 and further into the impeller chamber 11, a full-scale water supply state begins.

The sucked water passes through the discharge passage 12 and enters the delivery tank section 1.
3, some of the water from the delivery tank section 13 is transferred to the communication passage 14.
It passes through and is recycled to the impeller chamber 11.

At this time, as shown in FIG. 7, when the tip e of one impeller 10 passes the tip of the discharge passage 12, the other impeller 1
The tip f of 0 does not pass through the communication passage 14. Most of the water flows into the water tank section 16 in the priming casing 4 through the flow hole 7 of the partition plate 6. A part of the water that has flowed into the water tank section 16 passes through the circulation hole 8 of the partition plate 6 and passes through the impeller chamber 1.
Most of the water flows into the water tank 40 from the discharge port 42 through the discharge pipe 44. Hereinafter, this state will be referred to as the feeding state.

Problems to be Solved by the Invention Figures 11 and 12 show the results of vibration frequency analysis of the pump in the above-mentioned feeding state (the vertical axis is the power vector of vibration, and the horizontal axis is the rotational order ratio) and the frequency analysis results. (The vertical axis is the noise level, and the horizontal axis is the rotational order ratio.) In the conventional configuration as described above, in the feeding state, the vibration frequency analysis in FIG. 11 shows that vibration peak values occur at the 6th and 12th rotational order ratios. As a result, according to the noise frequency analysis shown in FIG. 12, rotational order ratios of 6th and 12th (maximum value) occur, and the noise value increases.

The present invention takes into account the above-mentioned conventional problems and aims to provide a self-priming pump with low vibration and low noise.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method in which, at the same time, the tip of one blade passes through the outflow passage opening in the impeller chamber of the impeller casing, the tip of the other blade connects to the delivery tank section. The structure is such that the impeller chambers are connected to each other through a passage that communicates with the impeller chamber.

Effect: Due to the above configuration, the impact when passing through the impeller blade tip or each passage in the impeller chamber occurs simultaneously, and the phase of the pulsating flow matches, making the water flow smoother. The impact on the impeller casing will be reduced.

EXAMPLE A self-priming pump according to an example of the present invention will be described below. The basic configuration of the self-priming pump according to this example is the same as that shown in the previous and next examples, and components with the same configuration and function are given the same reference numerals to avoid duplication. Therefore, its explanation will be omitted.

FIG. 1 is a perspective view of the impeller casing, and FIG. 2 is a plan view of the impeller casing. Figures 3 and 4 show the vibration frequency analysis results of this example (the vertical axis is the vibration power spectrum, the horizontal axis is the rotational order ratio) and the noise frequency analysis results (the vertical axis is the noise level, and the horizontal axis is the rotational order ratio). It is the rotational order ratio.

). The characteristic structure of this embodiment is that, as shown in FIG.
The blades have a mutual positional relationship such that they pass through a passage 14 that communicates the blades 3 and the impeller chamber 11.

In the above configuration, each of the tips of the two blades is a passage 1 that communicates with the inlet of the outflow passage 12, the delivery tank portion, and the impeller chamber.
4 at the same time, the phases of the inlet of the outflow passage 12 and the inflow of the outflow 2 in the passage 14 match, that is, the phases of the pulsating flow match, resulting in a smooth flow, and the impeller The impact applied to the casing 3 is reduced to reduce noise.

This is clear from the vibration frequency analysis results in FIG. 3, that is, the peak values of vibrations of the 6th and 12th orders of rotational order ratio are reduced compared to the conventional example (dotted line).

In addition, as the peak value of vibration decreases as described above, the rotational order ratio is 6th, 1st, and
The secondary and A range noise values are reduced compared to the conventional example (dotted line).

Effects of the Invention As is clear from the description of the embodiments above, in the self-priming pump of the present invention, the tip of the blade of one impeller passes through the outlet of the outflow passage, and at the same time, the tip of the other blade connects to the delivery tank section. By passing through a passage that communicates with the impeller chamber, the impact occurs when the tip of the blade passes through the passage, and the flow of water becomes smoother, reducing the impact, resulting in lower vibration and noise of the pump. It has excellent effects.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an impeller casing according to an embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is a vibration power spectrum characteristic diagram, Fig. 4 is a noise level characteristic diagram, and Figs. Fig. 12 shows a conventional example, Fig. 5 is a cross-sectional side view of a conventional self-priming pump, Fig. 6 is an exploded perspective view of the same main parts, Fig. 7 is a perspective view of the impeller casing, and Fig. 8 The figure is a perspective view of the priming casing, Figure 9 is a sectional view taken along line C-C in Figure 5, and Figure 10 is a sectional view of the
11 is a vibration power spectrum characteristic diagram, FIG. 12 is a noise level characteristic diagram, and FIG. 13 is a schematic diagram showing the pump in use. 3... Impeller casing, 10... Impeller, 12... Discharge passage, 13... Delivery tank section, 14... Communication aisle. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 1 3 - Impeller 1st route 2nd Figure 3 One revolution/X 1st m - Fig. 4 0 ratio of dislocation number Fig. 10 Fig. 11 Fig. 6 1 tO/2 /4 /6 - Ratio to rotation blowing - → Fig. 12

Claims (1)

[Claims] An electric motor, an impeller fixed to a rotating shaft of the electric motor, an impeller chamber for accommodating the impeller, an outflow passage through which water flows out from the impeller chamber, a delivery tank portion for receiving the outflow water, and a delivery tank. an impeller casing including a passage communicating between the tank section and the impeller chamber; an air-water separation chamber communicating with the delivery tank section; and an air-water separation chamber communicating with the air-water separation chamber;
and a priming water casing that stores priming water to be sent into the impeller chamber, and at the same time the tip of one blade of the impeller passes through the entrance of the outflow passage, the tip of the other blade communicates between the delivery tank section and the impeller chamber. A self-priming pump whose blades are positioned relative to each other so that they pass through a passageway.